uk.kludje.fn

Interface Nullifier<T,R>

Type Parameters:

T - the input

R - the result

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

Deprecated.

use Nullifier instead; this type will be removed

@FunctionalInterface
 @Deprecated
public interface Nullifier<T,R>

A functional interface with null-safe checks. For use with getter chains where one or more elements in the chain can be null. Example usage:

D d = Nullifier.span(A::getB, B::getC, C::getD).apply(a);

Implement $apply(Object); invoke apply(Object).

Method Summary

Modifier and Type	Method and Description
R	$apply(T t) Deprecated. Implement this method with a lambda expression/method reference.
default <V> Nullifier<T,V>	andThenSpan(Nullifier<? super R,? extends V> after) Deprecated.
default R	apply(T t) Deprecated. If the argument is null, returns null; else invokes $apply(Object).
static <A,B,C,D,E,Z> Nullifier<A,Z>	span(Nullifier<A,B> f0, Nullifier<B,C> f1, Nullifier<C,D> f2, Nullifier<D,E> f3, Nullifier<E,Z> f4) Deprecated.
static <A,B,C,D,Z> Nullifier<A,Z>	span(Nullifier<A,B> f0, Nullifier<B,C> f1, Nullifier<C,D> f2, Nullifier<D,Z> f3) Deprecated.
static <A,B,C,Z> Nullifier<A,Z>	span(Nullifier<A,B> f0, Nullifier<B,C> f1, Nullifier<C,Z> f2) Deprecated.
static <A,B,Z> Nullifier<A,Z>	span(Nullifier<A,B> f0, Nullifier<B,Z> f1) Deprecated. Creates a null-safe chain of calls spanning possibly null call sites.

Method Detail

apply

default R apply(T t)

Deprecated.

If the argument is null, returns null; else invokes $apply(Object). This method rethrows any exception thrown by $apply(Object) as an unchecked exception.

Parameters:

t - the input which may be null

Returns:

the result which may be null

See Also:

Exceptions.throwChecked(Throwable)

$apply

R $apply(T t)
  throws java.lang.Exception

Deprecated.

Implement this method with a lambda expression/method reference. Consumers should invoke apply(Object) and NOT call this method directly.

Parameters:

t - the argument

Returns:

the result

Throws:

java.lang.Exception - on error

andThenSpan

default <V> Nullifier<T,V> andThenSpan(Nullifier<? super R,? extends V> after)

Deprecated.

span

static <A,B,Z> Nullifier<A,Z> span(Nullifier<A,B> f0,
                                   Nullifier<B,Z> f1)

Deprecated.

Creates a null-safe chain of calls spanning possibly null call sites. The functions may not be null, but the inputs and outputs may be.

Type Parameters:

A - the initial type

B - an intermediary type

Z - the resultant type

Parameters:

f0 - the initial function; may not be null

f1 - a subsequent function; may not be null

Returns:

a function that, given A, returns Z, or null if any element in the chain is null

span

static <A,B,C,Z> Nullifier<A,Z> span(Nullifier<A,B> f0,
                                     Nullifier<B,C> f1,
                                     Nullifier<C,Z> f2)

Deprecated.

span

static <A,B,C,D,Z> Nullifier<A,Z> span(Nullifier<A,B> f0,
                                       Nullifier<B,C> f1,
                                       Nullifier<C,D> f2,
                                       Nullifier<D,Z> f3)

Deprecated.

span

static <A,B,C,D,E,Z> Nullifier<A,Z> span(Nullifier<A,B> f0,
                                         Nullifier<B,C> f1,
                                         Nullifier<C,D> f2,
                                         Nullifier<D,E> f3,
                                         Nullifier<E,Z> f4)

Deprecated.